Worked on improving the reliability of trace replay workflows in the facebookresearch/param repository by addressing a critical issue in blocking mode. Applied debugging and system testing skills to implement a barrier synchronization mechanism, ensuring that data validation completes without causing rank unsynchronization or process hangs. Enhanced performance optimization by reducing the risk of deadlocks and improving the consistency of benchmarking runs. Added explicit logging in Python to confirm successful data validation, increasing observability and traceability of the process. The solution focused on robust sequencing and concurrency patterns, resulting in more stable and reproducible trace replay operations for the project.